feat: centralize prompts and add customization UI for App Spec, Context, Suggestions, Tasks

- Add 4 new prompt type interfaces (AppSpecPrompts, ContextDescriptionPrompts,
  SuggestionsPrompts, TaskExecutionPrompts) with resolved types
- Add default prompts for all new categories to @automaker/prompts/defaults.ts
- Add merge functions for new prompt categories in merge.ts
- Update settings-helpers.ts getPromptCustomization() to return all 12 categories
- Update server routes (generate-spec, generate-features-from-spec, describe-file,
  describe-image, generate-suggestions) to use centralized prompts
- Add 4 new tabs in prompt customization UI (App Spec, Context, Suggestions, Tasks)
- Fix Ideation tab layout using grid-cols-4 for even distribution

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

libs/prompts/src/index.ts

@@ -43,6 +43,40 @@ export {
   DEFAULT_ENHANCEMENT_PROMPTS,
   DEFAULT_COMMIT_MESSAGE_SYSTEM_PROMPT,
   DEFAULT_COMMIT_MESSAGE_PROMPTS,
+  DEFAULT_TITLE_GENERATION_SYSTEM_PROMPT,
+  DEFAULT_TITLE_GENERATION_PROMPTS,
+  DEFAULT_ISSUE_VALIDATION_SYSTEM_PROMPT,
+  DEFAULT_ISSUE_VALIDATION_PROMPTS,
+  DEFAULT_IDEATION_SYSTEM_PROMPT,
+  DEFAULT_SUGGESTIONS_SYSTEM_PROMPT,
+  DEFAULT_IDEATION_PROMPTS,
+  // App Spec prompts
+  DEFAULT_APP_SPEC_GENERATE_SYSTEM_PROMPT,
+  DEFAULT_APP_SPEC_STRUCTURED_INSTRUCTIONS,
+  DEFAULT_GENERATE_FEATURES_FROM_SPEC_PROMPT,
+  DEFAULT_APP_SPEC_PROMPTS,
+  // Context Description prompts
+  DEFAULT_DESCRIBE_FILE_PROMPT,
+  DEFAULT_DESCRIBE_IMAGE_PROMPT,
+  DEFAULT_CONTEXT_DESCRIPTION_PROMPTS,
+  // Suggestions prompts
+  DEFAULT_SUGGESTIONS_FEATURES_PROMPT,
+  DEFAULT_SUGGESTIONS_REFACTORING_PROMPT,
+  DEFAULT_SUGGESTIONS_SECURITY_PROMPT,
+  DEFAULT_SUGGESTIONS_PERFORMANCE_PROMPT,
+  DEFAULT_SUGGESTIONS_BASE_TEMPLATE,
+  DEFAULT_SUGGESTIONS_PROMPTS,
+  // Task Execution prompts
+  DEFAULT_TASK_PROMPT_TEMPLATE,
+  DEFAULT_IMPLEMENTATION_INSTRUCTIONS,
+  DEFAULT_PLAYWRIGHT_VERIFICATION_INSTRUCTIONS,
+  DEFAULT_LEARNING_EXTRACTION_SYSTEM_PROMPT,
+  DEFAULT_LEARNING_EXTRACTION_USER_TEMPLATE,
+  DEFAULT_PLAN_REVISION_TEMPLATE,
+  DEFAULT_CONTINUATION_AFTER_APPROVAL_TEMPLATE,
+  DEFAULT_RESUME_FEATURE_TEMPLATE,
+  DEFAULT_PROJECT_ANALYSIS_PROMPT,
+  DEFAULT_TASK_EXECUTION_PROMPTS,
   DEFAULT_PROMPTS,
 } from './defaults.js';
 
@@ -53,6 +87,13 @@ export {
   mergeBacklogPlanPrompts,
   mergeEnhancementPrompts,
   mergeCommitMessagePrompts,
+  mergeTitleGenerationPrompts,
+  mergeIssueValidationPrompts,
+  mergeIdeationPrompts,
+  mergeAppSpecPrompts,
+  mergeContextDescriptionPrompts,
+  mergeSuggestionsPrompts,
+  mergeTaskExecutionPrompts,
   mergeAllPrompts,
 } from './merge.js';
 
@@ -63,4 +104,11 @@ export type {
   ResolvedBacklogPlanPrompts,
   ResolvedEnhancementPrompts,
   ResolvedCommitMessagePrompts,
+  ResolvedTitleGenerationPrompts,
+  ResolvedIssueValidationPrompts,
+  ResolvedIdeationPrompts,
+  ResolvedAppSpecPrompts,
+  ResolvedContextDescriptionPrompts,
+  ResolvedSuggestionsPrompts,
+  ResolvedTaskExecutionPrompts,
 } from '@automaker/types';